doc: updated README.md

flewsoftware · Dec 11, 2020 · e8be5b2 · e8be5b2
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 ## REEXT
 
 Quickly and easily replace extensions inside a directory
+
+### Flags
+* `--dirLocation` - location of the directory
+* `--oldExt` - extension to replace
+* `--newExt` - replace value